Replacing your rusty fuel tank and you were able to find every single part you needed except for the factory rollover valve?   
 
This is the original factory Mopar rollover valve that has TWO barbs/nipples on the top of it (the second barb is a built in high pressure/safety valve).  The aftermarket one only has one barb.   If you want to roll the dice with the aftermarket one, be my guest.
 
If you are looking for the correct factory valve, this is it.  Brand new in its original sealed Mopar packaging.